Question

(i) write the electronic configurations of the following ions : (a) `H^(+)` (b) `Na^(+)` (c) `O^(2-)` (d) `F^(-)` ltbr. (ii) What are the atomic number of elements whose outermost electrons are represented by (a) `3s^(1)` (b) `2p^(3)` and (c) `3 d^(6)` ?

Answer 1

(i) (a) `._(1)H=1 s^(1) :. H^(+)=1 s^(0)" "`(b) `._(11)Na=1 s^(2) 2s^(2) 2p^(6) 3s^(1) :. Na^(+)=1s^(2) 2s^(2) 2p^(6)`
(c) `._(8)O=1 s^(2) 2s^(2) 2p^(4) :. O^(2-)=1 s^(2) 2s^(2) 2p^(6)" "`(d) `._(9)F=1 s^(2) 2s^(2) 2p^(5) :. F^(-) =1 s^(2) 2s^(2) 2p^(6)`
(ii) (a) `1s^(2) 2s^(2) 2p^(6) 3s^(1) (Z=11)" "`(b) `1s^(2) 2s^(2) 2p^(3) (Z=7)`
(c) `1s^(2) 2s^(2) 2p^(6) 3s^(2) 3p^(6) 4s^(2) 3d^(6) (Z=26)`.